Microfluidic manipulation via Marangoni forces

Farahi, R.H.; Passian, A.; Ferrell, T.L.; Thundat, T.
November 2004
Applied Physics Letters;11/1/2004, Vol. 85 Issue 18, p4237
Academic Journal
A convective flow system is engendered when two liquid droplets, or a liquid droplet and a solid surface, are maintained at different temperatures. Such flows give rise to Marangoni forces which under proper conditions prevent droplet coalescence, cause fluid motion, and dewetting. We present a study of adsorbed and applied fluid movement on a solid surface driven by surface tension gradients created by thermal gradients. Flexible control over the silicone oil and 1,3,5-trinitrotoluene movement is accomplished with an array of individually controllable gold thin film thermal elements on a fused silica substrate surface. We thus demonstrate unlimited fluid movements in one dimension.


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